1 // SPDX-License-Identifier: GPL-2.0 2 /* Intel DWMAC platform driver 3 * 4 * Copyright(C) 2020 Intel Corporation 5 */ 6 7 #include <linux/ethtool.h> 8 #include <linux/module.h> 9 #include <linux/of.h> 10 #include <linux/of_device.h> 11 #include <linux/platform_device.h> 12 #include <linux/stmmac.h> 13 14 #include "dwmac4.h" 15 #include "stmmac.h" 16 #include "stmmac_platform.h" 17 18 struct intel_dwmac { 19 struct device *dev; 20 struct clk *tx_clk; 21 const struct intel_dwmac_data *data; 22 }; 23 24 struct intel_dwmac_data { 25 void (*fix_mac_speed)(void *priv, unsigned int speed); 26 unsigned long ptp_ref_clk_rate; 27 unsigned long tx_clk_rate; 28 bool tx_clk_en; 29 }; 30 31 static void kmb_eth_fix_mac_speed(void *priv, unsigned int speed) 32 { 33 struct intel_dwmac *dwmac = priv; 34 unsigned long rate; 35 int ret; 36 37 rate = clk_get_rate(dwmac->tx_clk); 38 39 switch (speed) { 40 case SPEED_1000: 41 rate = 125000000; 42 break; 43 44 case SPEED_100: 45 rate = 25000000; 46 break; 47 48 case SPEED_10: 49 rate = 2500000; 50 break; 51 52 default: 53 dev_err(dwmac->dev, "Invalid speed\n"); 54 break; 55 } 56 57 ret = clk_set_rate(dwmac->tx_clk, rate); 58 if (ret) 59 dev_err(dwmac->dev, "Failed to configure tx clock rate\n"); 60 } 61 62 static const struct intel_dwmac_data kmb_data = { 63 .fix_mac_speed = kmb_eth_fix_mac_speed, 64 .ptp_ref_clk_rate = 200000000, 65 .tx_clk_rate = 125000000, 66 .tx_clk_en = true, 67 }; 68 69 static const struct of_device_id intel_eth_plat_match[] = { 70 { .compatible = "intel,keembay-dwmac", .data = &kmb_data }, 71 { } 72 }; 73 MODULE_DEVICE_TABLE(of, intel_eth_plat_match); 74 75 static int intel_eth_plat_probe(struct platform_device *pdev) 76 { 77 struct plat_stmmacenet_data *plat_dat; 78 struct stmmac_resources stmmac_res; 79 const struct of_device_id *match; 80 struct intel_dwmac *dwmac; 81 unsigned long rate; 82 int ret; 83 84 ret = stmmac_get_platform_resources(pdev, &stmmac_res); 85 if (ret) 86 return ret; 87 88 plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac); 89 if (IS_ERR(plat_dat)) { 90 dev_err(&pdev->dev, "dt configuration failed\n"); 91 return PTR_ERR(plat_dat); 92 } 93 94 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL); 95 if (!dwmac) { 96 ret = -ENOMEM; 97 goto err_remove_config_dt; 98 } 99 100 dwmac->dev = &pdev->dev; 101 dwmac->tx_clk = NULL; 102 103 match = of_match_device(intel_eth_plat_match, &pdev->dev); 104 if (match && match->data) { 105 dwmac->data = (const struct intel_dwmac_data *)match->data; 106 107 if (dwmac->data->fix_mac_speed) 108 plat_dat->fix_mac_speed = dwmac->data->fix_mac_speed; 109 110 /* Enable TX clock */ 111 if (dwmac->data->tx_clk_en) { 112 dwmac->tx_clk = devm_clk_get(&pdev->dev, "tx_clk"); 113 if (IS_ERR(dwmac->tx_clk)) { 114 ret = PTR_ERR(dwmac->tx_clk); 115 goto err_remove_config_dt; 116 } 117 118 clk_prepare_enable(dwmac->tx_clk); 119 120 /* Check and configure TX clock rate */ 121 rate = clk_get_rate(dwmac->tx_clk); 122 if (dwmac->data->tx_clk_rate && 123 rate != dwmac->data->tx_clk_rate) { 124 rate = dwmac->data->tx_clk_rate; 125 ret = clk_set_rate(dwmac->tx_clk, rate); 126 if (ret) { 127 dev_err(&pdev->dev, 128 "Failed to set tx_clk\n"); 129 goto err_remove_config_dt; 130 } 131 } 132 } 133 134 /* Check and configure PTP ref clock rate */ 135 rate = clk_get_rate(plat_dat->clk_ptp_ref); 136 if (dwmac->data->ptp_ref_clk_rate && 137 rate != dwmac->data->ptp_ref_clk_rate) { 138 rate = dwmac->data->ptp_ref_clk_rate; 139 ret = clk_set_rate(plat_dat->clk_ptp_ref, rate); 140 if (ret) { 141 dev_err(&pdev->dev, 142 "Failed to set clk_ptp_ref\n"); 143 goto err_remove_config_dt; 144 } 145 } 146 } 147 148 plat_dat->bsp_priv = dwmac; 149 plat_dat->eee_usecs_rate = plat_dat->clk_ptp_rate; 150 151 if (plat_dat->eee_usecs_rate > 0) { 152 u32 tx_lpi_usec; 153 154 tx_lpi_usec = (plat_dat->eee_usecs_rate / 1000000) - 1; 155 writel(tx_lpi_usec, stmmac_res.addr + GMAC_1US_TIC_COUNTER); 156 } 157 158 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); 159 if (ret) { 160 clk_disable_unprepare(dwmac->tx_clk); 161 goto err_remove_config_dt; 162 } 163 164 return 0; 165 166 err_remove_config_dt: 167 stmmac_remove_config_dt(pdev, plat_dat); 168 169 return ret; 170 } 171 172 static int intel_eth_plat_remove(struct platform_device *pdev) 173 { 174 struct intel_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev); 175 int ret; 176 177 ret = stmmac_pltfr_remove(pdev); 178 clk_disable_unprepare(dwmac->tx_clk); 179 180 return ret; 181 } 182 183 static struct platform_driver intel_eth_plat_driver = { 184 .probe = intel_eth_plat_probe, 185 .remove = intel_eth_plat_remove, 186 .driver = { 187 .name = "intel-eth-plat", 188 .pm = &stmmac_pltfr_pm_ops, 189 .of_match_table = intel_eth_plat_match, 190 }, 191 }; 192 module_platform_driver(intel_eth_plat_driver); 193 194 MODULE_LICENSE("GPL v2"); 195 MODULE_DESCRIPTION("Intel DWMAC platform driver"); 196